The process of lifting and placing the span took two hours, and it followed recent work to install the landings and stairs on both platforms.
The next milestone at Llanelli station will see the lift shafts installed in the coming weeks as the project gathers pace.
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Theo Smith, Network Rail Wales and Borders lead portfolio manager, said: "We're really pleased to see the work progressing well at Llanelli station with the successful installation of the bridge span, following on from the recent installation of the staircases and landings.
"I'd like to thank passengers and residents for their patience while we continue making these important improvements. I look forward to seeing the completion of this work, which will provide a fully accessible station and more comfortable journeys for all rail users."
