(15 Apr 2016, 7:48 pm)Multi21 wrote My guess would be the two darts are there to replace the E200s and the ALX dart as cover.
The E200s went a while ago due to unreliability - they bought the 07 Solo to go on the 84, and the two red Solos cover the 56/82/88 and 87 diagrams, with B10BLE as backup.