The concrete pad next to the SEPTA trolley tracks is sinking (possibly from the weight of the buses). The asphalt to the right (west) of this concrete is several inches higher. There is a 10' long section just north of McKean Street where the asphalt forms this 'ledge'.
If you bump along this with your bike tire, it's like hitting a wall (sideways). I've seen three bike accidents and have reported the issue to 311 to no avail.