My Williams locomotives are all "covered wagons." Many varieties of E-7's, F-3's, Alco PA's and FA's, and 7 Genesis locos. Some steam, and most color schemes made in the scale GG-1's. I run heavy 21" passenger trains mixed with GGD, Lionel, Atlas, K-line cars. The Williams locos fast starts are tamed by the heavy trains.
Ive never had a problem with any Williams products.