Is this LEGO part still sought after by collectors?

Yes, as a specific 3-piece component from the 2002 9V theme, it is valuable for specialized MOC builders.

What is the specific set number for this motor?

The set number for this LEGO Electric Train Motor is 10153-1.

This item was originally released in the year 2002.

Name: LEGO Electric Train Motor 9V (My Own Train) (10153-1)
Brand: LEGO

9V · 2002

Theme · 9VPieces · 3Set Number · 10153-1Year · 2002

Used

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New / Sealed

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Is this LEGO part still sought after by collectors?: Yes, as a specific 3-piece component from the 2002 9V theme, it is valuable for specialized MOC builders.
What is the specific set number for this motor?: The set number for this LEGO Electric Train Motor is 10153-1.
What year was this LEGO item originally released?: This item was originally released in the year 2002.