Introduction:

Coastal Line (CTL) is a fictional Mass Rapid Transit line on the platform Roblox. It is currently operated by Transit Services. It opened in 3 phases, excluding one unopened future station. CTL was an idea we had when we decided to venture out from building buses to trains, a different yet related alternative transport mode.  We decided to make it manual-driven after completing our R151 train model.

Although we previously attempted this with Eastern Line (ETL), it was a failure due to its unreliable automation, with players reporting the iconic ETL "10-step braking". However, we decided to use this opportunity to pay respects to Eastern Line by incorporating it into at least one station of Coastal Line to form an interchange station, though it does not need to function.

Phase 1 (January 2026):

We gathered our innovation team and started building four stations that would later become CTL Phase 1. They were Seafront, South Coast, Hydrangea and Lorong Sheng. We started by arranging the station's base with an island platform and two V2 Plattform Screen Doors, one on each side of the platform. The exception was with Hydrangea, which had side platforms.

Our "interior designer", YuMing0509, proceeded to decorate the stations with his "modern art". Though for Hydrangea, other innovators wanted to build it entirely by themselves. Overall, all the stations were completely swiftly and CTL Phase 1 was formed. During this phase, we rectified any errors that was present with the R151 train model that we built.

Phase 2 (February 2026):

For Phase 2, we decided to build majority of the stations overground to provide some variation. The exception was with Eastern Vista and Uptown, for Uptown which one of the developers wanted to build it on the subsurface level. As for Eastern Vista, we wanted a cross-platform interchange with the Coastal Line, which meant it had to be underground to be ideal.

We invited a few other developers to help us for Phase 2 stations, bringing in unique designs for the stations. Phase 2 was also when our half height Platform Screen Doors made their debut, being installed at Clances, Wertheal and Uptown. Many new trains were also built as part of Phase 2, such as our C951, C151 and others.

Phase 3 (August 2026):

There was quite a bit of delay before we released Phase 3. There were some ongoing issues internally which led to some delay as well as the developers focusing on other commitments. However, it also meant that when Phase 3 was released, there were minimal amount of bugs to rectify and we could spend time making the station's architecture better. We also upgraded Phase 2 Uptown station as part of Phase 3.

We wanted Phase 3 to have one station that looked like it would belong in Phase 1, one station that looked like it would belong in Phase 2, and lastly one station unique to Phase 3. For the first criteria, we chose Carnation. It is underground and has a typical Phase 1 station layout. For the second criteria, we chose Coastal Point. It has an overground platform that looked similar to Wertheal. For the last criteria, we chose Undefinon Airport, with a middle track and very Sci-Fi style architecture,