Large Transport; Low Wing; 2 Turbojet Eng
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 137
Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Procedure; Equipment / Tooling; Airport
We were cleared for takeoff on Runway 25R in LAS. We began our power up and takeoff roll; however the aircraft engines were slow to spool up. As we began a slow takeoff roll; Tower instructed the aircraft behind us on the taxiway to line up and wait on 25R. Also there was a Company aircraft holding short of 25R at A5 waiting to cross to the ramp. As we got about halfway to two thirds through the red centerline lights lengthwise; they illuminated red. We both believed they were triggered for the aircraft lining up and waiting behind us; and Tower never mentioned anything to us. We both verified the runway was clear in front of us. So we continued the takeoff roll and departed without any incident. However; it was a distraction to both of us.If the lights were indeed meant for the aircraft behind us; wait until we are past them to illuminate them. We could have double checked the takeoff clearance during the roll with ATC.
I don't know if an aircraft on the Runway 19S triggered the lights or what happened but we continued the takeoff without incident. I did not notify the Tower Controller of the incident.
Air carrier flight crew reported observing the Runway Status Light system turn red near the end of the takeoff roll from LAS Runway 25R; possibly due to an aircraft being cleared to line up and wait behind them.