Orient Express holograms

In 2370, when the USS Enterprise was generating an emergent lifeform, a holodeck served as the consciousness of the neural net of emergent circuit nodes. Several different holodeck programs were running simultaneously and portions of the different programs comprised the simulation. The Orient Express was the venue of a portion of the simulation, comprising of charecters from several different simulations representing nodes in different systems of the ship. (TNG: "Emergence")

The Conductor

The conductor

The conductor was a holodeck character presumably from the original Orient Express program. When an emergent lifeform was trying to finding vertion particles to sustain itself, various characters in this program represented the nodes in different systems of the Enterprise-D. The conductor seemed to be the warp engines and guidance system. He agreed to allow the personnel of the Enterprise to help him find Vertiform City so the lifeform could get the vertion particles. (TNG: "Emergence")

The conductor was played by David Huddleston.

The Engineer

The engineer

The engineer was a holographic character presumably from the original Orient Express program, much favored by Beverly Crusher. When the Enterprise-D was generating an emergent lifeform in 2370, this character interacted directly with the ship's engine systems and appeared to represent the Enterprise's navigation system. When Data and Riker visited the holodeck to determine what was happening and why the ships systems were acting erratically, they were confronted by the conductor. The engineer attempted to defend the Enterprise crew, and told them that the other characters were hijacking the train. He was killed by another character called the hitman. (TNG: "Emergence")

The engineer was played by Thomas Kopache, a regular Star Trek guest actor.

Flappers

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Two flappers

The flappers were holographic characters possibly from the original Orient Express program. When the Enterprise-D was generating an emergent lifeform, they were working on a jigsaw puzzle which represented the lifeform. It is possible they represented the merged replicator and transporter systems constructing the lifeform in the cargo bay. (TNG: "Emergence")

One of the flappers was played by extra D. Zanuck, the other by an actress with the last name Reed. Neither received on-screen credit for their appearance.

Gunslinger

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The gunslinger

The gunslinger was a holographic character that was probably from Worf's Deadwood holoprogram, and might have been Frank Hollander. He appeared on the Orient Express as the systems of the Enterprise were forming the new lifeform. He had a piece of a puzzle that the Flappers were working on. The puzzle was a representation of the lifeform. It was theorized, he represented the nodes of the weapon systems of the Enterprise. He played cards with the hitman, although he was tied up. (TNG: "Emergence")

The gunslinger was played by extra S. Whitaker, who received no on-screen credit for his appearance.

The Hayseed

The hayseed

The hayseed was a holographic farmer who appeared on the Orient Express, when an emergent life-force was trying to find vertion particles to sustain itself. When Data and Troi visited the holodeck to determine what was happening, they found the hayseed playing with a jigsaw puzzle that represented the lifeform. He did not know what he was making, but told Troi that he was on his way to New Vertiform City. When asked about the city, he said that there was a great restaurant to eat at. This was in reference for the lifeform's need to obtain vertion particles to sustain itself, and possibly pointing out this character represented the nodes in the tractor beam system used to collect the vertion particles. (TNG: "Emergence")

The hayseed was played by Arlee Reed.

The Hitman

The hitman

The hitman was a major character who appeared on the Orient Express. He propably originated from the Dixon Hill programs favored by Captain Jean-Luc Picard. His part was that of a stereotypical gangster: sinister, brutal, yet smartly dressed and polite.

When the holodeck became a focal point in the birth process of a new lifeform in 2370, the Hitman impersonated a threat to the Enterprise officers. With the holodeck safety protocol disabled, his sidearm could have proven deadly, as deadly as it had been to the holographic character of the engineer. As the program progressed, it became evident that it was The hitman's task to protect the early phases of the emergent lifeform's generation. Having completed this task by "laying the foundation" in a symbolic act at Keystone City, he exited from the scene. (TNG: "Emergence")

The hitman was played by actor Vinny Argiro.

Knight in Armor

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The Knight in armor

The knight in armor was a character from an unknown holodeck program, who appeared on the Orient Express, when the Enterprise-D was creating an emergent lifeform in 2370. (TNG: "Emergence")

The knight was played by extra Christopher Gilman, who received no on-screen credit for his appearance.

Man in grey flannel suit

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A businessman

The businessman was a character possibly from the original Orient Express program, who appeared in the train when the Enterprise-D was creating an emergent lifeform. Various characters in the merged program represented the systems of the Enterprise. He was reading a paper. (TNG: "Emergence")

He was played by extra Dennis Tracy, Patrick Stewart's longtime stand-in, who received no on-screen credit for his appearance.

Taxi Driver

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A Taxi driver

The taxi driver was a character from an unknown program, who appeared in Keystone City, when an emergent lifeform was being created by the systems of the Enterprise. He attempted to run over Data, as he was trying to access the ship's systems. Data held the taxi back with one hand as he used his other hand to depolarize the system. (TNG: "Emergence")

The taxi driver was played by stunt actor Nick Dimitri, who received no on-screen credit for his appearance.