How do you guys know it is a crossover??
To me, it look like a middle track 
I am not saying you guys are wrong or correct
Tell you how I eliminate:
- Tracks are of Woodlands Extension.
Suitable candidates are: Yishun Reverse Sidings, Woodlands Reverse
Sidings, Crossover after Sembawang, Crossover after Woodlands
- Tracks are apart, not together.
Suitable candidates are: Woodlands Reverse Sidings, Crossover after
Sembawang, Crossover after Woodlands.
- Rails are not frequently used
Suitable candidates are: Crossover after Sembawang. Crossover after
Woodlands
- Crossover towards your track, not away
Suitable candidate: Crossover after
Sembawang