Green’s Dictionary of Slang

1. (also big track) those streets or blocks in a city where prostitutes work; esp., in US, differentiating the East Coast cities from the slower world of the West, esp. California.

1969		‘Iceberg Slim’ Pimp 82: We’re going to the big track in the city.
1972		Milner & Milner Black Players 47: The fast track is the tough, fast-paced hustling world of the big cities back East, such as New York or Chicago.
1981		A.K. Shulman On the Stroll 3: Pimps call it [i.e. 42nd St, NYC] the fast track.
1999		‘Master Pimp’ Pimp’s Rap 37: One good year out here on this fast track dressing good and smelling like a French whore is all you need to get on your feet.

2. the lifestyle pursued by the ambitious and successful; also attrib.

1969		‘Iceberg Slim’ Pimp 74: I had to get on that fast track to pimping.
1972		(con. 1950s) D. Goines Whoreson 31: I’m ready for the fast track now, baby.
1998		I. Welsh Filth 187: That wee slag thinks that crawling up Toal’s erse is the way on to the fast track.
2000		T. Blacker Kill Your Darlings 193: I was the writer as man of action [...] a fast-track fictioneer.
2009		T. Black Gutted 13: I was fucking fast track; that wee shit-storm [...] just sped things up .
2012		R.A. Dickey Wherever I Wind Up 5: When you spend seven seasons in the same minor-league location [...] you’re not on what you’d call the fast track.