We are proud to offer upgrades to Paragon 4. Paragon 4 upgrades are available for any older HO Scale BLI engine as long as it has been produced in Paragon 3 or 4 at least once. If the engine has not been produced in Paragon 3 or 4, then we can still perform the upgrade, however sounds from a different engine will need to be used.


Due to compatibility issues, the cab light, if equiped, will either be set for a CV for manual control (in some cases with older QSI to Paragon 3 upgrade), if possible, or can be disconnected, or left alone which often means it will work backwards (in the case of a Paragon 2 to Paragon 3 upgrade).The smoke unit and cab light should work correctly for Paragon 3 to Paragon 4 upgrades.


Please be aware that when we perform the upgrade, we have to leave the smoke unit disconnected on Paragon and BlueLine series engines.


Paragon 2/3 to Paragon 4 will keep smoke unit functionality.


Paragon 2 diesel engines with smoke are not upgrdable to Paragon 4, without disconnecting the smoke unit.



NOTE: While the upgrade will include the decoder, no additional lights are wired in, etc.

About Us

We are the only authorized repair center for out of warranty BLI trains, and we are authorized to perform extra services, such as upgrading BlueLine to Paragon 4.

Authorized by Broadway Limited Imports