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The MCI D-Series is a model of motorcoach bus produced by Motor Coach Industries (MCI). The bus is primarily used by private companies operating scheduled service or commuter buses, government agencies for the transport of prisoners, and in more recent years, public transit agencies who use them on express routes. It is sold alongside the MCI J-Series bus, primarily used by tour and charter operators.

MCI D-Series
Greyhound Lines MCI 102-DL3 #6590 before remanufacturing
Overview
Manufacturer	Motor Coach Industries
Also called	Intercity Cruiser Commuter Cruiser Classic American Coach
Production	1992-present
Assembly	Pembina, North Dakota, United States
Body and chassis
Class	Tri-axle coach
Body style	Single-decker coach
Doors	1 or 2 with optional wheelchair lift door
Floor type	High-floor
Chassis	MCI special platform integral
Powertrain
Engine	Detroit Diesel Series 60, Caterpillar C10, Caterpillar 3176B, Caterpillar C12, Caterpillar C13, Cummins M11, Cummins ISL, Cummins ISM, Cummins ISX, battery-electric bus
Capacity	40-foot models: 38-53 45-foot models: 50-61
Dimensions
Length	40 feet (12 m) 45 feet (14 m)
Width	102 inches (2.6 m)
Height	137 inches (3.5 m) (1st and 2nd Gen) 141 inches (3.6 m) (3rd Gen)
Curb weight	35,100 lbs, GVWR 44,400 lbs OR 48,000 lbs
Chronology
Predecessor	MCI B-Series MCI C-Series MCI G-Series

The D-Series was introduced in February 1992 as MCI's first 45-foot (14 m) motorcoach, enabled by a December 1991 law change that allowed the additional length. The coach replaced the B- and C-Series models, which were equipped with obsolete two-stroke engines.

Development

Several changes in the industry in the late 1980s and early 1990s led to the development of the D-Series coach. First, was the growing calls to allow 45-foot (14 m) coaches (at the time prohibited by US law), second was that MCI's existing models were designed to use two-stroke engines and the company was looking to offer the new Detroit Diesel Series 60 four-stroke engines, and third was 1988 Canadian government request to develop a wheelchair accessible intercity bus.[1]

MCI developed two prototypes to test the various proposed changes. In 1989, the company stretched an existing 102-C3 model to 45 feet (14 m) and in May 1990, in partnership with the Canadian government, MCI built a wheelchair accessible bus with a wheelchair lift and an accessible bathroom.[1]

On December 18, 1991, the Intermodal Surface Transportation Efficiency Act was signed into law, allowing an increase of coach length to 45-feet. The earlier prototypes left MCI ready for the change. Less than three months later, at February 1992 UBOA Bus Expo, MCI introduced the 102-DL3. The model number represented its 102 in (2,600 mm) width, D for its model, L for long (45 feet) and 3 for three axles. MCI also offered the wheelchair lift and accessible lavatory as an option. Production of the coach started in late 1992.[2][3] The bus was quickly adopted by private companies operating scheduled service (like Greyhound Lines) or commuter buses.

A 40-foot (12 m) version of the D-Series, the 102-D3 was introduced in January 1994, replacing the B- and C-Series models in the MCI product line.[1]

At about the same time that the 102-D3 was introduced, MCI also started offering an ISTV (Inmate Security Transportation Vehicle) a prisoner transport vehicle version of the coach. ISTV models are designed to transport up to 69 inmates and are available with containment cells and a rear officer position.[4][5] The ISTV only comes in a 40-foot version which better fits existing sally ports at jail and prison facilities.[1]

In 1998, MCI introduced the E-Series, a more upscale model for tour and charter operators, which was later replaced by the current J-Series.[1]

Over time, the D-Series also became popular with public transit agencies who use them on express routes that travel long-distances on highways. Responding to transit agency requests, MCI started offering optional destination signs and two-piece sliding entry doors better suited to curbside loading compared to the one-piece swing out door. The motorcoach allows operators to have more seated passengers, which is preferred when operating at higher speeds for longer distances. The downside compared to a traditional low-floor transit bus is that motorcoaches only have one door and a high-floor that requires the use of a wheelchair lift, slowing boarding/alighting times.

In an attempt to address these problems, in 2017, MCI debuted a new version of the D-Series with a low-floor area in the middle of the coach. This area allows passengers who use a wheelchair to board much faster using a ramp, and provides a second door to allow passengers to board and alight at the same time. The trade-off was that the luggage space under the coach was largely eliminated, but few public transit operators used that space in normal operation. MCI named the coach the D45 CRT LE for commuter rapid transit, low entry. Because of the extensive changes necessary to the coach, MCI used the development of the D45 CRT LE as an opportunity to develop a second generation of the D-Series coach with new styling and updated systems and components. Those updates started rolling out to high-floor coach models in 2021.[1]

Variants

First Generation (Legacy)

The 102-D3 and 102-DL3, entered production in 1994 and 1992 respectively. The model number denoted the width (102 inches (2.6 m), exclusive of mirrors), "D" model, the "L" in the model name designates longer length (45 feet (14 m), nominally), and 3-axle configuration. The models have large, fender skirts and a rear-mounted radiator fan side-by-side with the intercooler fan. It has an air intake covered by a large grille, a two-piece engine door, small headlight/taillights, and a black roof cap. The models are also available with optional stainless steel front and/or sides as well as an optional rubber front bumper.

The 102-D3 and 102-DL3 were renamed D4000 and D4500 in 2001. In 2005, MCI started offering a facelifted model of the D-Series called the D4005 and D4505 to private-sector operators. The rear end cap design was updated in 2007 to accommodate new engines that met stricter EPA emissions regulations.

Commuter coach models were offered with a large destination sign above the front windows and bi-fold doors.[2] A prison transport coach version of the 40ft model was also offered, and continues to be offered as the D4000 ISTV.[6]

Model	Photo	Introduced	Discontinued	Notes
45-foot (14 m) Models
102-DL3/D4500		1992	2005	Models with wheelchair lifts designated 102-DLW3. Models with lower stainless steel fluting on the front and/or sides adds an "SS" designation to the end. Example: 102-DL3SS. Renamed from 102-DL3 to D4500 in 2001.
D4500CL		2005	present	Updated version of the D4500, with the same front fascia.
D4500CT	(original headlights)	2005		Updated version of the D4500 Received an overhaul in 2014 To be phased out at the end of 2022. CNG model (designated D4500CT CNG) offered 2014-present. Hybrid model (designated D4500CTH) offered 2008-present.
	(optional updated headlights)
D4505	(original headlights)	2005	present	Mechanically similar to the D4500 but facelifted with the front end developed for G-Series. Received an overhaul in 2014
	(optional updated headlights)
40-foot (12 m) Models
102-D3/D4000		1994	2005	Models with wheelchair lifts designated 102-DW3. Models with lower stainless steel fluting on the front and/or sides adds an "SS" designation to the end. Example: 102-D3SS. CNG model (designated 102-DWA3 CNG) was offered exclusivley for the 1999-2000 model years[7][better source needed] Renamed from 102-D3 to D4000 in 2001. Hybrid model (designated D4000H) and 96-inch (2.4 m) wide model (designated D4000N[3]) were offered exclusively for the 2002 model year.[8][better source needed]
D4000CL		2006	present	Updated version of the D4000, with the same front and rear fascias.
D4000CT				Updated version of the D4000 Has the headlights from the G-Series. CNG model (designated D4000CT CNG) offered 2010-present.
D4000 ISTV		2001[9][better source needed]		Inmate Security Transportation Vehicle, designed for transporting up to 69 inmates and is available with containment cells and a rear officer position.[4][10]
D4005		2005	present	Mechanically similar to the D4000 but facelifted with the front end developed for G-Series.

Second Generation (Next Generation)

The D45 CRT, D45 CRT LE and, D4520 coaches make up the next generation of D-Series coaches, which have a taller body based on the J-Series coach with cosmetic updates. The commuter coach models ditch MCI's traditional alphanumerical naming system and are instead named using a modified alphanumerical naming system. For example" "D" generation or basic model, "45" for the length, "CRT" for "commuter rapid transit" and "LE" for modes with the Low Entry door. The touring coach model, the D4520, retains MCI's traditional alphanumerical naming system, with "20", denoting the third generation D-Series.

Model	Photo	Introduced	Notes
45-foot (14 m) Models
D45 CRT LE		2017	Replaced D4500CT Commuter coach with low-entry area and wheelchair ramp Electric version (designated D45 CRT LE CHARGE) offered
D45 CRT		2020	Commuter coach with wheelchair lift Replaced D4500CT
D4520		2020	Touring coach. Replaced D4505
40-foot (12 m) Models
D40 CRT		(future)	Commuter coach with wheelchair lift To replace D4000
D4020		(future)	Touring coach. To replace D4005
D4020 ISTV		(future)	Inmate Security Transportation Vehicle To replace D4000 ISTV

See also

• MCI J-Series
•  Buses portal

References

External links

• Media related to MCI D-Series at Wikimedia Commons

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