The open electric trams of Porto

In 1903 the workshops converted an open mule car to an electric car for service on the longest lines. It got the number 40 and made a successful test run on 21 February 1904. The fate of this car is a mystery as it was not reported anymore after 1904.

In 1904 A Constructora converted two further open mule cars into electric cars. They had transverse benches of 1.80 m. The cars got the numbers 41-42, after 1907 141-142. In 1924 they were renumbered into 100 & 115. They were used on all routes except to Gaia. As they had compared to other tramcars many seats and little standing capacity, they were often used on longer routes like line 9 and later also line 10. Probably both were lost in the Boavista fire of 1928.