They learned they can get away with anything, and that even the leftmost Democrats will crush a strike.

… three railway men are standing before a London coroner’s jury — a guard, an engine-driver, a signalman. A tremendous railway accident has hurried hundreds of passengers into another world. The negligence of the employee is the cause of the misfortune. They declare with one voice before the jury that ten or twelve years before, their labour only lasted eight hours a-day. During the last five or six years it had been screwed up to 14, 18, and 20 hours, and under a specially severe pressure of holiday-makers, at times of excursion trains, it often lasted for 40 or 50 hours without a break. They were ordinary men, not Cyclops. At a certain point their labour-power failed. Torpor seized them. Their brain ceased to think, their eyes to see. The thoroughly “respectable” British jurymen answered by a verdict that sent them to the next assizes on a charge of manslaughter, and, in a gentle “rider” to their verdict, expressed the pious hope that the capitalistic magnates of the railways would, in future, be more extravagant in the purchase of a sufficient quantity of labour-power, and more “abstemious,” more “self-denying,” more “thrifty,” in the draining of paid labour-power.

-Capital, Vol. 1: Chapter 10: The Working-Day

There should've been a railroad strike

What's the worst they could happen