One trip early in the morning and two later in the evening will be added once Arrow receives permission to implement a quiet zone and stop sounding train horns at level crossings along the route.

[11][12] An additional FLIRT utilizing hydrogen fuel cell energy storage has been developed by Stadler for use on the line, with a planned introduction in 2024.

[13][14][15] Previous rail service in Redlands included the Pacific Electric "Red Car" trolley system and the Atchison, Topeka and Santa Fe Railway.

The PE's San Bernardino Line served Redlands from Los Angeles by way of its Eastern District, which opened in 1905 and was abandoned in 1937.

[20] Proposals for a restored passenger rail connection between San Bernardino and Redlands were made as early as the 1990s, with the service originally projected to start in 1995.

[6] The first contract for the project was awarded on November 2, 2011, by San Bernardino Associated Governments (SANBAG) to HDR, Inc. for engineering and environmental services.

[5] The estimated cost of heavy rail service was $198.6 million, which could be paid for using federal transportation grants that were based on population and sales tax revenues.

[27][9][19] The project encountered further delays, including the U.S. federal government's shutdown in October 2013, after which point the construction was slated to begin in fall of 2016.

Initial plans called for a stop at Waterman Avenue in San Bernardino next to the Inland Regional Center, but the station was later moved to Tippecanoe Avenue instead, citing higher ridership due to the Inland Regional Center's heightened security after the San Bernardino mass shooting, as well as zoning modifications near the Waterman stop.

[2] The route and stations were shown as an under-construction extension of the San Bernardino Line on Metrolink's transit map that month.