Polar Bear was relaunched on 13 July 2013 by BBC newsreader and railway enthusiast Nicholas Owen.

[1] Polar Bear made its fourth visit to the Groudle Glen Railway since it was preserved in late July 2016.

In January 2013 the Groudle Glen Railway announced a plan to construct a new locomotive to be named Brown Bear.

Some of these, such as the change from Baguley's modified valve gear to Bagnall Price gear, can be attributed to changes in key personnel at Bagnall's; others, such as the larger-bore cylinders, increased grate area and increased driving wheel diameter were likely based on the nine years of experience with Sea Lion.

The most obvious visible difference between the two is the change from round to rectangular spectacle plates in the front cab sheet, which improved the forward vision for the driver.