Trains, the magazine of railroading has a list of the top 10 locomotives that changed railroading and I figured I would share that info with all of you. #1 The American 4-4-0 / Invented in the 1830's, it used a bogie 4 wheel lead truckand flexible 3 point suspension that made it great to run on roughly laid iron tracks very reliably. 25,000 American 4-4-0 locomotives were built and were even found operating in the 1950's on class I #2 The Baldwin 4-6-2 Pacific / The first example was built in 1901, due to it's design and wheel configuration, the deep fire box on this locomotive is what gave it the speed needed for passenger service. The Pacific was the go to locomotive for passenger service until the mid 1950's #3 The Lima Berkshire 2-8-4 / In 1925, this locomotive was tested on New York Central's route across Berkshire hills in 1925, both how it got it's name and showing off it's power. With a larger boiler, this locomotive produced 35% more horsepower over any other locomotive it's size. 610 Berkshires were built, of that New York Central ordered 45 of them. #4 The Alco 4-6-6-4 Challenger / With trains getting longer and heavier, this locomotive provided one long boiler using 2 sets of pistons and drive wheels. This was also a articulated steam locomotive. The first 13 examples were built in 1936, Union Pacific teamed up with Alco on these examples. 252 Challengers were built, Union Pacific owned 105 of them including 6 passenger versions. #5 The EMD FT / THe diesel locomotive that knocked steam engines off of the map forever. GM started mass producing these in 1939 and it's dependabilty to move freight without stopping for water, moving freight faster and in extreme temperatures is what made this one a steam engine killer. Some FT's were even into passenger service, I know Rio Grande used them also in passenger service. Many railroads re-geared these to run with the later F-3, F-5, F-7 and F-9 locomotives. Santa Fe was the largest owner of EMD FT locomotives. A total of 1,096 FT's were made, 555 A uits and 541 B units from 1939 to 1945 #6 The Alco RS1 / The final drive that ended steam power. The RS-1 road switcher was made starting in 1941 with it's 1,000 hp diesel engine. It was the first successful mass produced diesel engine made for light duty chores. It's short hood provided room for a bigger fuel tank or a steam boiler to keep passenger cars warm. There were 469 RS-1 locomotives built and they hold the longest production run of any diesel locomotive made in North America. The last one was built in 1960. The US government used 6 axle versions in WW II, you can find one sitting at the Pennsylvania Railroad museum outside yard. They also have a military 6 axle flat bed to go with it. #7 The EMD GP-7 / This had to be the easiest EMD locomotive to service and work on, why they never kept producing it is beyond me. You can still find these operating today on short lines, my short line owns 6 of them. The GP stood for General purpose and eliminated the need for keeping different locomotives for different tasks. THe reliabilty, the ease of maintenance, and the design to make it easy to make major repairs on is what makes this a wanted locomotive on many short lines today. There were 2,709 GP-7 locomotives built from 1949 to 1954. The GP-7 was later replaced by the GP-9, basically almost the same locomotive except with a dynamic brake. #8 The GE U25B / This locomotive was made to do battle with it's competitor EMD division. This locomotive is what helped put GE in the front and has stayed in the front ever since. This locomotive is also what put Alco out of buisness forever. Introduced in 1959, the U25B featured a pressurized engine compartment and a 16 cylinder engine. The U in the model designation stood for "Universal" series. The bullet proof 752 series traction motors is what kept customers coming back for more. #9 The EMD SD40-2 / This locomotive was railroadings super star featuring a powerful and reliable 3,000 hp 16 cylinder 645 engine. The number 645 means it has 645 cubic inches for every cylinder, thats 16 times 645 cubic inches which equals a total of 10,320 cubic inches. Today EMD has a 721 engine which you can get up to a 20 cylinder engine, thats a wow factor there. Anyway, the letters "SD: stand for Severe Duty, but it still had the all purpose duty also of the GP series. This locomotive had a modular electrical control cabinet and standardized parts so you could swp them out between sister models. EMD built 4,000 SD40-2 locomotives between 1972 and 1986 making this model the best selling model built. The number 1 customer was Burlington Northern with 775 units combined with 200 units from Santa Fe in the BNSF merger, the second was Union Pacific at 700 units and then 3rd goes to Canadia Pacific at 480 units. #10 The GE ES44 / The letters "ES" in the model name stand for Evolution Series. This locomotive is very modern featuring a low emissions engine. It also features a 12 cylinder diesel engine that has more horse power of a 16 cylinder with better fuel economy. It also features steerable trucks, on board diagnostics that alert crews to problems. This locomotive is available in DC or AC power, but the AC version out sells the DC version by 3 to 1 which is a testament to the better pulling power of AC units. This locomotive sure has put a dent into EMD's SD-70Ace selling market. Hopefully EMD will spring back with something else, I love EMD locomotives. Note: This top ten was provided by Trains magazine and was not my opinion how these were rated and picked out for the top 10.