Fromstream +‎style.

streamstyle (third-person singular simple presentstreamstyles,present participlestreamstyling,simple past and past participlestreamstyled)

1. (uncommon) to give something astreamlined style.
   • 1959,Steam's Finest Hour, edited by David P. Morgan, Kalmbach Publishing Co., page 113, referring to Canadian Pacific 4-4-4s:

     Streamstyled in the manner of the Hudsons, these lightweights were unusually capable for their size.

   • 1959, David P. Morgan, editor,Steam's Finest Hour, Kalmbach Publishing Co., page11:

     And then there's Rutland, so far behind the others in motive power that it was obliged tostreamstyle a 1911 2-8-0 with Stephenson gear when itsWhippet hotshot was introduced in 1938.

• streamline