I remember going through Changi in 1985, and as we taxied past the terminal there was the entire fleet of four 757's in SQ livery. I don't know if they ever had any more than four but do remember they replaced the old 727's in the fleet. I did manage to take a shot but it may take a while to find as it not with my regular airliner photos. If I find it I'll scan it in and send it to you.
I remember when the DC-3 was new!