Update

When Gerald opened his eyes, he found himself staring out of the window of the train, watching himself in the distance, leaning against the bus, protesting the inevitable. Sally sat next to him on a small aluminium stool, a large panel of knobs and buttons in front of her. She wore a sky-blue shirt and navy trousers.
'Jesus Gerald!' Her exclamation made him jump. She looked over to him, panic in her eyes. 'I can't stop it in time,' she held her hands up to her trembling mouth. 'Oh Jesus,' she moaned.
Gerald put his hand on her shoulder, 'It's going to be okay.'
'How can you say that? Look!' She pointed through the windscreen, 'Somebody's on the tracks too!'
'Come here,' Gerald said, putting his arm across her back. She instinctively wrapped her arms around him, sobbing into his chest. 'It's okay, I'll stop it.'
She sniffed and pulled away, her eyes red with tears. 'How?' Her confusion was overwhelming. The question sent waves of doubt through Gerald.
'I,' he began. 'I just will.' He added, 'Right?'
Sally turned her head towards the windscreen, wiping tears from her eyes. She squinted then turned back to Gerald. 'Is that you?'
'Yeah,' Gerald said. 'Or,' he added, 'A part of me.'
She sniffed again and grabbed at Gerald's shirt, 'Can you do it?'
'You told me I could,' Gerald countered.
'You can't stop a train!' Her eyes began to well up again, 'You'll be killed!'
Gerald felt a momentary sense of failure and he couldn't tell why. 'But you told me,' he stammered.
She didn't speak, just looked up at him, her eyes red and wild.
'You told me,' Gerald repeated. 'Sally, come on,' he leant down and pulled her close. 'You said I could save the children.'
She simply shook her head in disbelief before whispering, 'You'll be killed.'
Gerald turned around, clasping his head in his hands. 'Come on!' The frustration finally boiling over. 'What the fuck is going on?' Gerald questioned nobody in particular. He turned back to Sally who looked traumatised. 'Fuck it, I'm going!'
Gerald stepped towards the windscreen when he heard Sally whisper, 'Don't.'
'And why shouldn't I? Huh?' Gerald leant over her, yelling into her face. 'I've had enough of this shit!'
'Don't kill yourself,' she whispered, looking through the window.
'Why not?' Gerald screamed at the back wall of the train cabin. He turned to Sally, 'You're in here,' he said tapping his temple, 'Give me a reason why not!'
Sally looked up at him, her eyes big and frightened. 'What about your family?'
'Wrong!' Gerald screamed, 'I don't have a family, remember?' He tapped his temple again, 'You'll have to do better than that.'
'Friends?' Sally questioned.
Gerald pulled back, placing his hands over his face and laughing. 'I don't have any friends.'
'What about me?' She said it with a sense of desperate hope in her voice.
'You?' Gerald pulled his hands from his face. 'You?' He repeated this quietly, stepping over to Sally. He leant in close to her face and whispered, 'But you're not real,' his hand stroking her cheek.
'I am real,' she pulled back, offended. She placed her hand on his cheek, 'I am real, and I'm your friend Gerald.'
Gerald shook his head in disbelief. 'No. The only time we were friends was a dream,' Gerald tapped his temple again, trying to get the point across. 'When I went to your house, you slammed the door on me. That was real!'
'I don't remember that,' Sally looked down at her lap.
'Because it wasn't you!' Gerald cried. 'It was the real Sally!'
'I am the real Sally,' she murmured, almost inaudible.
'No! No, you're not. The real Sally studies at uni.' Gerald began counting on his fingers, one, 'She isn't my girlfriend!' Two, 'She isn't a prostitute!' Three, 'And she isn't a fucking train driver!'
Sally's eyes widened at the last sentence and before Gerald could add something about how he meant train conductor, she had vanished.
'Fuck,' Gerald sighed. When he looked through the windscreen, he could see two of himself talking to each other at the bus. One of them stepped over and merged with the other. Gerald moved through the front of the speeding train and flew into himself. His two bodies blending into one, just as the train hit.