Tegan grinned as Major Haggard fell from the train. At least he couldn’t hurt anyone else now.
Then she saw how close the engine was to the edge of the cliff. She didn’t need the Doctor’s math skills to know they were going too fast to stop now. In the distance she heard someone calling her name, but there was no time to look. She ran to the TARDIS, fumbling in her pocket for the key as the train broke through the barrier. She slipped the key into the lock and turned it, but nothing happened. The lock was stuck!