Singapore Buses route 139

Service 139 is a trunk route running between Toa Payoh Int and Bukit Merah Int, passing through St. Michael’s Estate, Jalan Besar / Serangoon Road, Dhoby Ghaut, River Valley, Alexandra and Lengkok Bahru. A route variant (139M) is also operated.

Originally double deckers were operated until 1999, it was deploying Leyland Olympian 2-Axles and Leyland Olympian 3-Axles at that time. Double deckers had been operated once again since September 2011 using Leyland Olympian 3-Axles and Volvo Olympian 3-Axles, and had their crossover to 90 until 139M had started operating.