The idea of the tracks stretching into the future leaves revolution as a receding moment--the station we never quite arrive in. The result, contra to the revolutionary intervention, it is the constant stoking of the train, i.e. the capitalist productive forces. This is another instance of accelerationism, which either tries to actively increase the speed of capital, or simply because the passenger on the train, allowing the constant destruction of living labor at the hands of dead labor to do the work.
The conclusion is that the emergency brake is not merely calling to a halt for the sake of it, some static stopping at a particular point in capitalist history (say Swedish Social Democracy--which the American Republican Right now takes as the true horror of 'socialism'). Neither is it a return back to some utopian pre-capitalist moment, which would fall foul of Marx and Engels's anathemas against 'feudal socialism'. Rather, Benjamin argues that: 'Classless society is not the final goal of historical progress but its frequently miscarried, ultimately [endlich] achieved interruption.' We interrupt to prevent catastrophe, we destroy the tracks to prevent the greater destruction of acceleration.