page_title: 4D Train
hierarchical_section_title: 4D Train
caption_attribution_description: The now scrapped 4D prototype EMU at Spencer St.
context_page_description: The 4D was a prototype double deck electric multiple unit built for the Public Transport Corporation, Victoria, Australia, for operation on the Melbourne railway system. It remains the only double deck train ever to have run in Melbourne. The train's name stood for "Double Deck Development and Demonstration."
  Depending on sources, the intention was for this train to be the demonstration unit for a future order of either 20 or 50 extra sets, had the tests been successful.
context_section_description: The 4D was a prototype double deck electric multiple unit built for the Public Transport Corporation, Victoria, Australia, for operation on the Melbourne railway system. It remains the only double deck train ever to have run in Melbourne. The train's name stood for "Double Deck Development and Demonstration."
  Depending on sources, the intention was for this train to be the demonstration unit for a future order of either 20 or 50 extra sets, had the tests been successful.
caption: 4D train at Spencer Street
exif: {}