I can't help you about the part on finding the KTM since I also use google map to find it.
So I believe you can find it with a bit more effort on your side.

You can't shoot the station itself since it is off limits but the HDB at Spooner road should still be open.
Most of the fun starts from Bukit Timah station towards Woodlands with one metal bridge, one small stone bridge, four cross road junction, one LRT overhead, one MRT overhead.
And let's not forget about the abandoned metal bridge at Sunset way since it is so nearby. It spans over a canal that is a challenge to cross over for first timers.