Sub-structure

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grade = the slope or inclination of the track camber = cant = the difference in elevation (height) between the two rails or edges of the road ballast = the material, typically crushed stone or gravel, that is laid beneath and around railroad ties to provide stability, support the weight of the tracks, and facilitate drainage sub-ballast = the layer placed beneath the track ballast in railway construction formation = the part of the railway installations that carries the rolling traffic adequate = sufficient for a specific need or requirement pressing issue = a problem or subject that is urgent and needs immediate attention clogged = blocked or filled with something debris = the remains of something broken down or destroyed
EFL subset that concentrates more on language in context than on grammar and language structures. It covers topics from accounting or computer science to tourism and business management. "Specific" means the studying through a field that is already known and relevant to a student.