Table B-2. Table of Class Lives and Recovery Periods. Summary: This table lists the recovery periods (in years) for depreciable assets used listed business activities. The table lists the asset class, description of asset, the recovery periods for: Class Life (in years), General Depreciation System (Modified Accelerated Cost Recovery System) and Alternative Depreciation System. This section lists the asset classes of 40.1--Railroad Machinery and Equipment, Roadway accounts and Equipment accounts to 46.0--Pipeline Transportation.