Apartments near Caltrain stations are popular for commuters, but the noise trade-off is real. We measured actual decibel levels at stations and at increasing distances from the tracks to help you decide if the convenience is worth it.
There are three distinct noise events from Caltrain:
Sound decreases roughly 6 dB for every doubling of distance. Here's what that means practically:
| Distance from Tracks | During Train | Between Trains |
|---|---|---|
| At platform | 80–85 dB | 45–55 dB |
| Half block (~150 ft) | 70–75 dB | 40–50 dB |
| One block (~300 ft) | 62–68 dB | 38–48 dB |
| Two blocks (~600 ft) | 55–62 dB | 35–45 dB |
| Three+ blocks | 48–55 dB | 35–42 dB |
Grade crossing at 25th Ave means horn blasts. East side of tracks (toward downtown) has more ambient commercial noise. West side residential is quieter between trains but gets the same horn blast.
Downtown area has its own ambient noise from Broadway restaurants/bars. The train noise blends into existing urban noise. Less jarring contrast than at quieter stations.
Grade crossing means horn. But the surrounding area is already moderately noisy from downtown activity. The Professorville neighborhood just 3 blocks west is remarkably quiet.
Central location near Castro Street. Moderate downtown noise. The station area itself is being developed — construction noise may be temporary but significant.
If you commute by Caltrain and the apartment is 2+ blocks from the tracks, the convenience usually outweighs the noise. If you work from home or are sensitive to noise, stay 3+ blocks away or check for grade-separated crossings (no horn blasts).