You can take a MRT train from any MRT station in Singapore to Marsiling MRT station (North-South line). This is the nearest MRT station (1.5km or 15 min walk) to the KTM Woodlands Train Checkpoint. Note that there is a taxi rank in front of the pedestrian exit/entrance to the KTM Woodlands Train Checkpoint. This train station is linked to the Woodlands Checkpoint by an overhead bridge. Once you walk past the taxi rank, you will need to go to level 3 to reach the overhead bridge using the escalators or elevators. You can also head to the taxi rank or go to the Marsiling MRT station on foot or by public bus once your clear Singapore immigration and customs. Instead of going down the staircase/escalator after clearing customs, walk along the passageway to the left of the staircase/elevator, turn left and then walk across the overhead bridge until you see the escalators or elevators at the end. Use them to go to the ground level. SMRT bus number 950 goes between Marsiling MRT station and the Woodlands Checkpoint. Note that the last southbound train leaves Marsiling MRT station for Marina Bay/Toa Payoh/Ang Mo Kio MRT station (the last stop on the North-South line) at 2310/2346/0035 hrs respectively. In the other direction, the last train leaves for Jurong East MRT station at 0029 hrs.
Johor Bahru has a spanking new JB Sentral railway station along Jalan Tun Abdul Razak and Jalan Jim Quee. It is connected to both the CIQ and City Square by pedestrian overhead bridges. There are retail outlets (including a 24-hr 7-Eleven store), food and beverage outlets (including a Kentucky Fried Chicken outlet open daily 8am to midnight and Old Malaya Kopitiam serving local cuisine) and five money exchange offices (the one at street level is open 24hr) in the new station. There are coin-operated (2 x 50 sen), small left luggage lockers, a Muslim prayer room, male/female toilets (both free of charge), a police post and a tourist information booth in here as well. KTM train services to and from here started on 21 Oct 2010. The old train station, located just two hundred meters south of JB Sentral along Jalan Tun Abdul Razak and facing Merlin Tower, has been decommissioned.
KTM trains between Singapore and West Malaysia (7 per day in each direction, all via JB) all cross the Causeway. As of 1 July 2011, all KTM services to and from the old Singapore railway station in Tanjong Pagar have ceased, and all trains now depart from the Woodlands Train Checkpoint, which is just 700m from the start of the causeway. Immigration procedures are now back to standard international practice. When you go from Singapore to West Malaysia by the KTM train, you get stamped out by Singapore immigration first inside the Woodlands Train Checkpoint, and just across the hallway, Malaysian immigration stamps you in before you board the KTM train. In the reverse direction, Malaysia immigration stamps you out on board the train at JB Sentral, and upon the train reaching Woodlands Train Checkpoint, you disembark and Singapore immigration stamps you in. Given the fact that the train fare between Woodlands Train Checkpoint and JB Sentral is at least three times the bus fare between Woodlands Checkpoint and Johor Bahru CIQ, only train buffs should consider taking the train instead of the bus. The lowest, adult/child, one-way fare for tickets purchased online from JB Sentral to Woodlands Train Checkpoint is 3, 7 or 11 RM/2, 6 or 10 RM. In the other direction, the lowest, adult/child, one-way fare for tickets purchased online is S$5 or 11/S$5 or 10. If the tickets are purchased at the ticket counter, the adult, lowest, one-way fare is 3 RM for all trains (JB Sentral to Woodlands Train Checkpoint, purchase the ticket no more than 30 minutes before the train's departure time) and S$3 or S$11 (Woodlands Trains Checkpoint to JB Sentral, purchase the ticket no more than 30 minutes or 24 hrs respectively before the train's departure time). The S$3 ticket is only for the 0800 and 1945 trains; the other train tickets cost S$11. Go to KTM's website for the schedules and online booking. Online ticket purchases can only be made within 30 days of the departure date but not less than 48 hours before the departure time.