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In its native form, it does not adequately represent key physical processes associated with road and rail surfaces, including impermeable surface behaviour, rapid water drainage and realistic snowmelt.  \nTo address this, the Met Office has already developed and scientifically evaluated an STF-JULES (\"Surface Transport Forecasting JULES\") capability based off a forked older version (v5.9) of the JULES codebase This includes:  \nconfiguration and parameter tuning for road and rail surfaces;  \nmodifications to surface hydrology behaviour to represent impermeable transport surfaces;  \nmodifications to thermal conductivity and heat capacity handling;\nimplementation of a road drainage/run-off scheme;  \nmodifications to snow handling to retain meltwater within the road surface water store .\n The existing source code modifications are contained within a small number of JULES routines:  \nheat_con_jls_mod.F90  \nsoil_htc_jls_mod.F90  \nroad_drain_jls_mod.F90  \nsurf_hyd_jls_mod.F90  \nThe supplier is required to migrate the existing STF-JULES developments into the latest JULES version and complete the work through to successful merge into the main JULES master branch.  \nIn addition to porting these routines, the supplier shall:  \nidentify and migrate all associated namelist, Rose suite and configuration file changes;  \nidentify differences in output behaviour with the existing STF-JULES implementation;  \ndeliver the changes through to successful integration into the JULES master branch.  \n The work shall be considered complete when:  \nall agreed STF-JULES science developments have been successfully migrated into the latest supported JULES version;  \nall required namelists, Rose suites and configuration files have been updated;  \nregression testing demonstrates no major unexplained changes relative to the existing STF-JULES implementation;  \na technical comparison report has been delivered describing:  \ndifferences between the original STF-JULES v5.9 implementation and the migrated implementation;  \nany changes in behaviour or performance;  \nany known limitations or unresolved issues;  \nall required technical documentation has been updated; and  \nthe changes have been successfully merged into the main JULES master branch.  \nThe supplier shall provide the following deliverables:  \n1. A one-page delivery and migration plan within one week of contract award.   \n2. Updated STF-JULES implementation within the latest supported JULES version by [DATE PROPOSED BY SUPPLIER], including:  \nmigrated source code changes;  \nupdated namelists, and configuration files   \n3. A technical comparison and validation report by [DATE PROPOSED BY SUPPLIER], containing:      \ncomparison between the original STF-JULES v5.9 implementation and the migrated implementation;  \ninvestigation into, and description of, any differences in behaviour or performance;  \nexplanation of expected differences arising from JULES version changes;  \nsummary of any known limitations or unresolved issues.  \n4. 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