It's a Sunday and everyone took the last remaining opportunity to walk on the railway tracks before they were to be dismantled.
I used to take the train to Kuala Lumpur so in a way would miss it somehow. The train boarding point at Woodlands would be too far away from where I am staying.
See how packed the place was:
Found an interesting article:
http://remembersingapore.wordpress.com/singapore-railway/