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This means: If only the front wheels are steered, the rearmost part of the formula can be left out. The most common example is probably the 4×4 configuration. 6×4*4 is the chassis configuration for a vehicle with six wheels where four wheels are driven, in addition, the two front wheels as well as the rearmost two wheels are steered.
The "A1A" truck is under the front of the unit, and has one powered axle, one idler axle, and one more powered axle. The "3" truck is under the back of the unit, and has three idler axles in a row. An example is the Baldwin DR-6-2-10 1,000 hp (750 kW) cab unit, only one of which was built for the Chicago and North Western Railway in 1948.
Co-Co is the wheel arrangement for diesel and electric locomotives with two six-wheeled bogies with all axles powered, with a separate traction motor per axle. The equivalent UIC classification (Europe) for this arrangement is Co′Co′ , or C-C for AAR (North America).
Two bogies or wheel assemblies under the unit. Each bogie has one powered axle, one idle axle, and one more powered axle. All powered axles are individually driven by traction motors. BB Four powered axles all mounted in the locomotive's frame, driven in pairs, i.e. each pair of axles is connected by driving rods or gears. Compare with "D" below.
The diesel electric locomotives employed by CFR and built by Electroputere Craiova are known as classes 60 to 68 and originally registered under the series 060-DA. They were based on a design created by SLM Winterthur, BBC Baden and Sulzer Winterthur and bears, externally, resemblance to AE 6/6 Swiss electric locomotives. [1]
The added carrying axle of the JNR Class ED62 Bo-1-Bo. Eighteen of the Japanese 3 ft 6 in (1,067 mm) narrow-gauge Bo-Bo electric JNR Class ED61 were rebuilt in the late 1970s to form the Class ED62. [1] An additional carrying axle was added between the bogies to give a B-1-B (AAR) or Bo′1Bo′ (UIC) arrangement.
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The formula for calculating RTI using a ramp as pictured above is r = d b × 1000 {\displaystyle r={\frac {d}{b}}\times 1000} Where b is the wheelbase of the vehicle, d is the distance travelled along a (usually 20 degree [ 1 ] ) ramp before any wheels leave the ground and r is the calculated ramp travel index.