Heard of Townlink? For the fare of one bus ride, the bus can
take you from one neighbourhood to another via the interchange/town
centre instead of having to take 2 feeder services by transferring
at the interchange.
Before this happened in 1996, Tampines had 290, 291, 292, 293,
294, 295, 296 and 297. 291 was merged from the original 291 and
295. 293 was formed by merger of the original 293, and 297.