Modern streetcars are rated around 8-9 percent max grade.
MBTA3247 wrote:Quickly looking at Goddard Blvd on Google Street View, it doesn't strike me as being an exceptionally steep road. There are probably sections of the B Line which are steeper. If Airport Drive is too steep for the final leg to the airport, it looks like there's plenty of undeveloped space on the east side for a light rail line to ditch street running and take a long, looping approach with moderate grades.I'm not sure of the ownership, but there is a good amount of undeveloped land surrounding the airport.