The Colfax corridor carries 48,000 weekday riders — MetroLink’s busiest line. A four-year expansion would add a parallel track, rebuild two stations, and upgrade signaling across six interlockings. The constraint was non-negotiable: rush-hour headways could not slip during construction.
Twelve vendors, one schedule
David Chen’s program office coordinated civil contractors, signaling engineers, station architects, and MetroLink’s own operations team. Each group maintained its own schedule. When a concrete pour slipped two days, the signaling contractor often learned from a hallway conversation, not a system update.
Riders do not care which contractor caused a delay. They care whether the 7:15 arrives. We needed one timeline everyone could trust.
Coordinating work around live service
Netisen deployed a program control layer that ingested construction schedules, signaling test windows, and live train movement data. Night-work permits were automatically checked against maintenance windows. When a track outage was approved, rider notification templates populated with accurate shuttle information before the first service alert went out.
- Single program timeline with dependency tracking across all workstreams
- Automated conflict detection between track outages and peak service periods
- Integrated rider comms — app, platform displays, and social channels from one source
- Daily ops brief generated from live data instead of manual slide decks
A Tuesday that proved the model
In March, an unexpected utility strike near Emerson station threatened to close one track during the evening peak. The platform flagged the conflict forty hours before the strike. Operations shifted two trains to the parallel track, pre-positioned ambassadors at the platform, and pushed a clear detour message to riders’ apps — all before the first afternoon rush train departed.
Ridership surveys from that quarter showed no statistically significant change in satisfaction scores despite active construction on four station platforms. For Chen, that was the metric that mattered most.