In January, Featherston Community Board chairwoman Lee Carter witnessed commuters with bikes unable to board the train because the storage carriage was full.
Since then Mrs Carter, who has commuted on the Wairarapa line for nearly two decades, has been collating data on instances where it has happened again.
The Featherston Community Board wrote to the committee in February highlighting the capacity issue, and asked them to consider a dedicated luggage carriage to alleviate the problem.
A report by the Sustainable Transport Committee said an AG wagon, which acts as a generator car and has luggage storage capability, would be on all weekend Wairarapa line train services.
The wagon would also be on a Friday night and Monday morning service, as well as on public holidays.
Mrs Carter said the extra space on Friday afternoons will benefit the Wairarapa area "in terms of bikes, tourism and our economic growth, and will be a small relief to commuters as well".
But she also thought "the wasted space of the servery" that had been "unused for nine years" could be utilised with self-serve luggage racks, freeing up space for more bikes during the weekdays.
"Another quick-win solution is to build into the existing luggage carriage a luggage rack that stores upwards and not just on ground level."
Mrs Carter recorded three bikes being turned away in February and 19 bikes turned away in March, including an 11-year-old boy travelling from the Hutt to Featherston.
She said all these instances had occurred on days Monday to Thursday.
The Sustainable Transport Committee would be updating GWRC at today's full council meeting as to when the service will be properly implemented.
