Turn cruise off on both engines in command mode. Use the cruise on/off switch (I don't tend to install these on my upgrades) or use the CAB-1 in command mode:
EOB cruise off: DIR + AUX1 + AUX1 + AUX1 (whistle/horn blast) + 3 (whistle/horn blast)
EOB 32 step cruise: DIR + AUX1 + AUX1 + AUX1 (whistle/horn blast) + 1 (whistle/horn blast)
EOB 128 step cruise: DIR + AUX1 + AUX1 + AUX1 (whistle/horn blast) + 2 (whistle/horn blast)
ERR Cruise off: AUX1 + 0 + AUX1 + BRAKE + 7 + BRAKE
ERR Cruise on: AUX1 + 0 + AUX1 + BRAKE + 9 + BRAKE
I've had some luck with cruise engaged on the leading engine and the trailing one on with cruise off.