The reference for locomotives and railcars
Hungarian State Railways series BCmot VIIa to VIId
De Dion-Bouton type steam railcars
Hungary | 1903 | 10 produced
BCmot VIIc
BCmot VIIc

The many branch lines with few gradients and low passenger numbers in the MÁV network offered themselves early on for the use of railcars. Ganz of Budapest secured the license for the De Dion-Bouton steam railcars and produced 30 or 89 examples for the MÁV, depending on the source. Ten railcars of the types with 35 and 50 hp were found under the generic designations BCMot VIIa to VIId, others were built with 80 hp

What was special about the De Dion-Bouton design was the steam engine, which was attached to the axle like a nose-suspended motor and was also sprung. The four cylinders with compound action were arranged horizontally and could run at a high speed of 600 to 800 revolutions per minute thanks to a gearbox. The steam came from a small, vertically arranged water-tube boiler, which operated at a relatively high pressure of 18 bars.

De Dion-Bouton type steam engine
De Dion-Bouton type steam engine
collection György Villányi

In addition to the different power output, the individual variants of type VII were characterized above all by a different layout of the interior. The greatest advantage of the special boilers was that they could be warmed up in an hour and could therefore simply be switched off overnight. It turned out, however, that the railcars had a high consumption and maintenance was relatively expensive. They were all phased out by the start of the First World War and replaced by railcars with combustion engines after the end of the war.

Axle config0-2-2T 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length35 ft 11 1/8 in35 ft 5 3/16 in38 ft 2 7/8 in
Wheelbase18 ft 0 9/16 in19 ft 8 1/4 in
Fixed wheelbase18 ft 0 9/16 in19 ft 8 1/4 in
Service weight31,967 lbs32,849 lbs30,424 lbs45,415 lbs
Adhesive weight24,251 lbs25,133 lbs24,030 lbs
Axle load24,251 lbs25,133 lbs24,030 lbs
Water capacity264 us gal
Fuel capacity220 lbs (coal)
Power sourcesteam
Indicated power35 hp (26 kW)50 hp (37 kW)
Optimal speed25 mph36 mph37 mph
Top speed28 mph31 mph
Starting effort899 lbf
with start valve1,053 lbf
Power Plant
Driver diameter39.7 in40.2 in
Boiler pressure261 psi
Expansion typecompound
Cylindersfour, HP: 4 9/16 x 5 1/2 in
and LP: 6 11/16 x 5 1/2 in
Calculated Values
steam railcar
secondary line
last changed: 06/2022

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