(svn r7620) -Fix: [OPF] signal update was incorrectly propagated:
- through incompatible rail types
- from under bridge track to the bridge ramp (peter1138)
- same for tunnels (from track on top of tunnel entry to the tunnel)

		.CODE

PUBLIC	_get_save_esp
_get_save_esp:
		MOV	RAX,RSP
		RET

PUBLIC	_rdtsc
_rdtsc:
		RDTSC
		MOV RCX,RDX
		SHL RCX,32
		AND RAX,0FFFFFFFFh
		OR  RAX,RCX
		RET

		END