MR-73
| MR-73 | |
|---|---|
An MR-73 train ariving at Lucien-L'Allier station, February 2009
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Refurbished interior of an MR-73 train
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| In service | 1976–present |
| Manufacturer | Bombardier Transportation |
| Built at | La Pocatière, QC |
| Constructed | 1974–1980 |
| Refurbishment | 2005–2008 |
| Number built | 423 vehicles (141 sets in 3-car formation, 47 sets in complete 9-car formation) |
| Formation | 6 or 9 cars per trainset |
| Capacity | 160 passengers per car, 39-40 passengers seated (1440 passengers in complete 9-car set) |
| Operator(s) | Société de transport de Montréal |
| Depot(s) | Plateau d'Youville, Saint-Charles, Montmorency |
| Line(s) served |
Orange Line (Montreal Metro), Blue Line (Montreal Metro), Green Line (Montreal Metro) |
| Specifications | |
| Car body construction | Lightweight steel alloy |
| Width | 2.5 m (8 ft 2 3⁄8 in) |
| Doors | 4 pairs per side |
| Maximum speed | 70–72 km/h (43.5–44.7 mph) |
| Weight | 26,990 kg (59,500 lb) per car (unladen) |
| Traction system | Jeumont chopper |
| Power output | 174 kW (233 hp) |
| Acceleration | 5.2 km/(h·s) or 3.2 mph/s |
| Power supply | (?) |
| Train heating | (?) |
| Electric system(s) | 750-volt DC guide bars |
| Current collection method | Contact shoe, side running |
| Bogies | 2 sets per car |
| Braking system(s) | Dynamic brakes |
| Safety system(s) | ATC (ATO) |
| Track gauge | 1,435 mm (4 ft 8 1⁄2 in) standard gauge |
The MR-73 is a type of train used on the Montreal Metro's Orange and Blue lines, with a minority of said trains being used on the Green Line.
In 1974, the Commission de transport de la Communauté urbaine de Montréal (CTCUM), the predecessor of the STM, awarded the contract to build 423 MR-73 cars to Bombardier Transportation. The MR-73 cars were manufactured from 1974 until 1980 and first entered service in 1976. The MR-73's original interior featured orange-and-white seats arranged such that in each third of the train there were two double sets of transverse seating and four single seats near the doors in longitudinal formation, which were removed during the 2005–2008 refurbishments and the seating arrangement subsequently modified.
The MR-73 is the second generation of high-performance Metro cars, identified by rectangular cab headlights, blue and dark orange interiors, 174 kW (233 hp) traction motors that growl while accelerating out of a station, side vents, and a unique three-note sound signature when the train pulls out of a station. The Mean Distance Between Failures (MDBF) for the MR-73 exceeds 200,000 mi (322,000 km) in 2004.
The initial rate of acceleration of the MR-73 model is 1.43 m/s2 (4.7 ft/s2) (5.2 km/(h·s) or 3.2 mph/s). The three-note sound is produced by traction motor control equipment called a "current chopper", which is used to control and power the motors on the train in stages without incurring a power surge. It does this by modulating the current in 5 consecutive stages (90, 120, 180, 240 and 360 Hz), the latter 3 being normally audible. A prototype for the current chopper was built by the Canron company using a Jeumont original design in the early 1970s on an MR-63 train. Two of the three elements of this "Jeumont Train" are operated on the Green Line among rheostatic-started MR-63s. One is much louder than the other. They are the only two to exhibit the whole five-note audible signature in normal operation, even though it is possible to hear them during longer than usual starts on regular MR-73s.
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Wikipedia