The Ghost of Bishan

Bishan MRT station sits on the grounds of Pek San Teng, a former cemetery. When the station opened in November 1987, multiple passengers reported seeing headless figures and other ghastly apparitions aimlessly wandering the site. 

Nighttime maintenance staff further exacerbated these rumours by saying that they saw coffin bearers in the tunnels between Bishan and Novena MRT, also built on the site of a former graveyard.
Source: https://theculturetrip.com/asia/singapore/