Trackside
MBTA Commuter Rail Fairmount Early data — logging since Aug 2026

Fairmount Line — this week

How reliably Fairmount Line trains ran this week, by day. Worst day this week: Wed 9/9, only 47% on time, typically 2 min late, worse-run trains ~4 min late.

Tue 9/8 Wed 9/9 Thu 9/10 Fri 9/11 Sat 9/12 Sun 9/13
Inbound 42% 54% 42% 57% 47% 70%
Outbound 52% 39% 54% 54% 79% 69%

The number in each cell is the share of trains on time that day — higher is better. The background colour grades that same number, so each row reads at a glance.

Tap or hover a day for the typical minutes late, how late the worse-running trains ran, and the train/arrival counts behind it.

Where delay builds

Typical delay along the route, across all recent weekdays — not just this week.

Inbound

5mReadville: usually on timeFairmount: usually on timeBlue Hill Avenue: usually 2 min lateMorton Street: usually 2 min lateTalbot Avenue: usually 2 min lateFour Corners/Geneva: usually 3 min lateUphams Corner: usually 2 min lateNewmarket: usually 2 min lateSouth Station: usually on time+3ReadvilleSouth Station

Outbound

10mSouth Station: usually 2 min lateNewmarket: usually 2 min lateUphams Corner: usually 2 min lateFour Corners/Geneva: usually 2 min lateTalbot Avenue: usually 2 min lateMorton Street: usually 2 min lateBlue Hill Avenue: usually 2 min lateFairmount: usually 2 min lateReadville: usually on time+2South StationReadville

Have an iPhone? Trackside’s app does live train tracking and arrival alerts for MARC today — MBTA Commuter Rail support is on the way.

← All lines this week