EMD F3
The EMD F3 is a series of diesel-electric locomotives of the U.S. locomotive manufacturer General Motors Electro-Motive Division. Originally designed as a freight locomotives, some specimens were also used in passenger train service.
A total of 1,111 aircraft were built with cab (A- units) and 696 führerstand loose B units. The last planes of F3 were delivered already with the improved traction motors of F7 and therefore considered nicknamed F5. However, these machines were built officially under the name F3.
Development
EMD F2
In 1945, EMD developed the proven in the previous series FT diesel engine EMD 567 on. The type designation EMD 567 meant that the engine had a swept volume of 567 cubic inches. The vehicles of the F- series had 16- cylinder engines, while the locomotives of EMD E - series machines two systems were installed, each with 12 cylinders. However, with the introduction DERS new engine development of the electrical equipment had not been completed in 1946. EMD provided the F2 from the second series of the F- series with the new engines, but had to curb the power of the diesel engine in order not to overload the generator and traction motors. Thus, the machines had an identical performance, as the FT. The pre-production version of its new series F2 was delivered in August 1945. As of May 1946, the delivery of the series machines began. In the further course of 1946, the advanced electrical equipment was available. For this reason, the F2 only a few copies (74 units F2A with cab and 30 führerstand loose F2B ) was built and stopped production in favor of the F3 after only 5 months. As a result, some F2 were upgraded to F3.
EMD F3
It was only in November 1946 were the first locomotives with the new D12 generator, which had a higher electrical performance compared to the FT and F2 used D8, are delivered. Thus, the full power of the diesel engine could be used.
Construction
Technically based the equipment of the F3 on the predecessor series FT. Changes primarily related to the electrical and mechanical equipment. Compared to the FT machines had an improved engine. Its performance was compared with the FT, again to 150 hp (110 kW) will be increased.
The F2 and F3 had a self-supporting locomotive body. In the A- units, a cab was arranged on the bogie designated as forward continuously. Behind the engine room was with the traction generator which supplied the DC power to the traction motors and the diesel engine EMD 567B. The exhaust gases from each of eight cylinders were taken via an exhaust pipe to the outside. The fuel tank and the battery box was placed between the bogies.