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164 
GERMAN TESTS WITH AN OIL-ENGINED RAILCAR
Page 111
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The new oil-engined railcar that is being tested by the German State Railway on its Berlin-Hamburg line appears to be giving satisfactory results in the way of economy. _Running costs are said to work out at about a third of those for the steam train, which it will replace towards the end of March or the beginning of April.
The arrangement comprises two cars, of lighter construction than the ordinary railway coach, united at the centre by a two-axle bogie. Front and rear are two Maybach oil engines, each of 410 h.p., and two control cabins.
Each engine is supported on two axles and weighs just under two tons. The total weight of the railcar is 74 tons and the overall length is 130 ft. Seating accommodation is provided for 102 passengers. Streamlining, which continental railway engineers are beginning to study seriously, has been well carried out.
The fuel tanks have a capacity of 990 litres, which allows the railcar to do its 180-mile journey nine times without a refill. Much time is thus saved and running costs proportionately reduced.
The Maybach engines are 12-cylindered Vee-type units, with a bore of 130 mm. and a stroke of 200 mm., delivering their power at a normal speed of 1,400 r.p.m. The overhead valves are operated through the medium of rockers, from a central camshaft, and the crankshaft is mounted on roller bearings. Large starter-dynamos are employed.