High temperatures can affect railroad infrastructure. When ambient temperatures reach 95°F, rail agencies implement heat restrictions to protect passengers, crews, and equipment.
Steel tracks expand in extreme heat. As temperatures rise, rails can become more flexible and more vulnerable to shifting, warping, or buckling. To reduce risk, trains must slow down and crews must inspect track conditions.
Heat restrictions apply to all rail services operating on the corridor, including passenger and freight trains.
When Heat Restrictions Begin
Heat restrictions are triggered once the ambient temperature reaches 95°F. At that point:
- Track inspections are required.
- Train speeds are reduced.
- Service delays may occur.
These measures remain in place until temperatures fall, and conditions are confirmed safe for normal operations.
Heat Restriction Levels
Level 1 — 95°F
- Passenger trains operate at a maximum speed of 60 mph.
- Freight trains operate at a maximum speed of 40 mph.
Level 2 — 105°F
- Passenger trains operate at a maximum speed of 50 mph.
- Freight trains operate at a maximum speed of 30 mph.
How This May Impact Your Trip
Reduced speeds increase travel times. During extreme heat events, riders may experience:
- Delays in one or both directions of travel
- Extended travel times between stations
Because all trains on the corridor must comply with speed restrictions, delays can affect multiple trips throughout the day.
Caltrain implements heat restrictions to maintain safe operations. Riders should check caltrain.com/alerts for real-time service updates during high-temperature events.
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