San Bernardino Line

The San Bernardino Line is the busiest of Southern California's seven Metrolink lines, running from Downtown Los Angeles east through the San Gabriel Valley and the Inland Empire to San Bernardino. It is one of the three initial lines (along with the Santa Clarita and Ventura Lines) on the original Metrolink system. When the line opened in 1992 service extended only as far as Pomona, but in 1993 the line was extended to San Bernardino. Saturday service was added in 1997 and Sunday service in 1998. The San Bernardino Line serves the following stations:

1. Union Station, Los Angeles
2. Cal State L.A., Los Angeles
3. El Monte, El Monte
4. Baldwin Park, Baldwin Park
5. Covina, Covina
6. Pomona (North), Pomona
7. Claremont, Claremont
8. Montclair, Montclair
9. Upland, Upland
10. Rancho Cucamonga, Rancho Cucamonga
11. Fontana, Fontana
12. Rialto, Rialto
13. Santa Fe Depot, San Bernardino

There are also platforms at Fairplex and Auto Club Speedway, but these are only used for special events.

As of July 2011, 21 trains run Los Angeles to San Bernardino on weekdays. It is the first of the seven Metrolink lines to run on both Saturday and Sunday, with 10 trains to San Bernardino on Saturdays and 7 on Sundays. Two Saturday and two Sunday trains continue to the Downtown Riverside Station.

After leaving Union Station and crossing the Los Angeles River the line follows the San Bernardino Freeway and El Monte Busway until just after the Cal State L.A. station; it then runs in the median of the San Bernardino Freeway to the El Monte Station. Starting at El Monte the line parallels the Union Pacific's Sunset Route (Ex-Southern Pacific) for a few miles before turning northeast at Bassett 34°03′03″N 117°59′50″W / 34.0507°N 117.9971°W / 34.0507; -117.9971 onto an SP branch. At 34°05′38″N 117°43′49″W / 34.0939°N 117.7303°W / 34.0939; -117.7303 (former SP/PE-SFe crossing) it switches to the Santa Fe; from Claremont to just west of San Bernardino it follows what was the Santa Fe's Pasadena Subdivision (and before that the Second District of the LA Division, the SFe passenger main line). The San Bernardino Line is mostly single track with 6 passing sidings and short sections of double track near Covina, between Pomona and Montclair, and west of Fontana.