SMRT Bus Service 451

SMRT Bus Service 451 is a limited-stop bus service, operating between Keat Hong Link and Bukit Gombak MRT during weekday peak hours. Bukit Gombak-bound trips are operated in the mornings, while Keat Hong Link-bound trips are operated in the evenings.

Service 451 commenced operations on 17 November 2025.

Route Overview
Route	[AM]: Keat Hong Link (Opp Blk 816A) → Bukit Batok West Avenue 5 (Bt Gombak Stn) [PM]: Bukit Batok West Avenue 5 (Opp Bt Gombak Stn) → Keat Hong Link (Blk 816B)
Passes Through	Choa Chu Kang Ave 1, Choa Chu Kang Ave 3, Brickland Rd
Route Length	Towards Bt Batok West Ave 5: 4.7 km						Towards Keat Hong Link: 4.9 km
Travelling Time	16 – 21 mins
Operator Information
BCM Route Package	Choa Chu Kang–Bukit Panjang Bus Package
Current Operator	SMRT Buses Ltd
Current Depot	Gali Batu Bus Depot
Current Fleet	Single-deck & Double-deck buses Includes electric single deck buses
Operating Hours
Departure Times from Keat Hong Link	Weekdays, except Public Holidays
	06:10 – 08:40
Departure Times from Bt Batok West Ave 5	Weekdays, except Public Holidays
	17:30 – 20:00
Operating Frequency
From Keat Hong Link	3 – 6 mins
From Bt Batok West Ave 5	9 – 12 mins
Fare Information
Fare	Charges regular distance fares

Bus Service 451 provides a faster connection for commuters travelling between the Keat Hong and Brickland estates and Bukit Gombak MRT Station. Operating as a limited-stop service, it provides a quicker alternative to Bus Service 991 during the weekday morning and evening peak hours.

The service replaces and enhances the former Short Trip Service 991C, which will be withdrawn on the same day. Compared to 991C, the new service covers more of Choa Chu Kang estate, while also being enhanced to operate in both directions during peak periods — towards Bukit Gombak MRT in the morning, and towards Keat Hong Link in the evening. The route also plies non-stop between Brickland Road and Bukit Gombak MRT, skipping two intermediate stop pairs along Bukit Batok West Avenue 5 that Service 991 and 991C previously served. This adjustment allows for shorter journey times and a more efficient connection to the rail network.

This limited-stop service is introduced under the Bus Connectivity Enhancement Programme (BCEP). It enhances connectivity for estates located farther away from transport nodes.

If the eves of Christmas, New Year’s Day, and Chinese New Year fall on a weekday, the Evening Peak departures may be brought forward to the afternoon. Revised departure times will be provided by the operator closer to the affected date.

MRT Station Served

• NS3 Bukit Gombak

Departure Timings

Weekdays (except Public Holidays)

• Morning Peak from Keat Hong Link (Opp Blk 816A):
  06:10, 06:16, 06:22, 06:28, 06:33, 06:37, 06:43, 06:46, 06:50, 06:55, 07:00, 07:06, 07:11, 07:15, 07:19, 07:24, 07:30, 07:36, 07:42, 07:48, 07:54, 08:00, 08:06, 08:11, 08:16, 08:22, 08:28, 08:34 & 08:40
• Evening Peak from Bukit Batok West Ave 5 (Opp Bt Gombak Stn):
  17:30, 17:39, 17:48, 17:56, 18:05, 18:15, 18:26, 18:38, 18:50, 19:02, 19:13, 19:24, 19:34, 19:43, 19:52 & 20:00

Gallery

Poster Gallery

Operator History

• 17 Nov 2025 – Present: SMRT Buses Ltd

Route History

• 2025 (17 Nov): Introduced from Keat Hong Link (Opp Blk 816A) to Bukit Batok West Ave 5 (Bt Gombak Stn) during morning peak hours and from Bukit Batok West Ave 5 (Opp Bt Gombak Stn) to Keat Hong Link (Blk 816B) during evening peak hours as a peak-hour one-directional limited stop service on weekdays (except public holidays) under the LTA’s Bus Connectivity Enhancement Programme (BCEP);
  This service is renumbered & enhanced from Short Trip Service 991C.

Past Routings

Changes in Departure Times:

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Back to Limited-stop Peak Period Bus Services