<p>The first in class unit results were fed back to the wider industry and Porterbrook looked to roll out the modification to other vehicles.  Greater Anglia and East Midlands Trains operated the same type of Class 156 units and by autumn 2017, a further 19 trains were fitted.  The autumn 2017 results repeated the success of the first in class unit.  </p>
<p>In 2018, Porterbrook continued to develop the design for other variants of the Class 15X units and produced a design for the single car Class 153 units.  This time the design was implemented on a further 34 trains operated by Greater Anglia, East Midlands Trains and West Midlands Trains.  Autumn 2018 performance showed that the system was also effective on these single car units.</p>
<p>In 2019, the Great Western Railway and Transport for Wales Class 150 fleets (53 trains) will be fitted in time for the leaf fall season. In addition, Porterbrook has shared the design more widely with other operators including ScotRail, which will fit its Class 156 fleet (43 trains) before autumn 2019.</p>