Trains can pull so much because the smoothness of the rails and the small contact area of the wheels create a low friction environment, allowing them to overcome the static friction that would hinder trucks from pulling the same weight.
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They rely on precise track. Rolling resistance of nicely round steel circle on nicely smooth steel rail is negligible to rubber-tarmac contact. The other thing it utilizes is the locomotive weight. The contact pressures in the wheel-rail contact are very high and they use sand to increase the traction.
If the train is heading in the direction in which the locomotive end of the train is facing, this is considered 'pulling'. If the train is heading in the opposite direction, this is considered 'pushing' and the motorman or engine driver is located in the alternative cab.
As far as I'm aware, there's no legal limit. Passenger trains do not normally exceed 12 cars (around 900 feet, dependent on rolling stock type), but many are much shorter than this.
World's most powerful electric locomotive Shen24 by CRRC for coal cargo service in China. China: The 28.8 MW 24-axle six-section locomotive develops starting tractive effort of 2,280 and continuous tractive effort of 1,596 kN reaching 120 km/h. Its official operation began in June 2021.
The heavier a locomotive is, the better the coefficient of adhesion, and the better the locomotive can transmit power to the rails without wheel slippage.
Trains are Reliable and Stress FreeWith high-speed rail, train travel is always faster than driving. In many cases, it's even faster than flying, once you factor in the whole air travel song-and-dance.
Looking at traffic fatalities per mile traveled in the U.S., analyst Todd Litman found that riding commuter or intercity rail is about 20 times safer than driving; riding metro or light rail is about 30 times safer; and riding the bus is about 60 times safer.
Greenhouse gas (GHG) emissions are directly related to fuel consumption. According to EPA data, freight railroads account for just 0.5% of total U.S. GHG emissions and just 1.7% of transportation-related GHG emissions. Moving freight by rail instead of truck lowers GHG emissions by up to 75%, on average.
'Train' comes from a French verb that meant to draw; drag. It originally referred to the part of a gown that trailed behind the wearer. The word train has been part of English since the 14th century—since its Middle English days.