Strong Tower Intermodal Demurrage Clock-Stop Standard: Drayage TMS Dispute Engine

Since 2008 Strong Tower Consulting has delivered transportation technology architecture for motor carriers, freight brokers, and private fleets. Our Intermodal Drayage practice has repeatedly observed catastrophic margin erosion caused by improper detention, demurrage, and per diem charges from ocean carriers and marine terminals. The Strong Tower Intermodal Demurrage Clock-Stop Standard™ was developed to eliminate this leakage through deterministic, auditable automation.

The Strong Tower Intermodal Demurrage Clock-Stop Standard™ Architecture

Strong Tower Consulting designed the Clock-Stop Standard as a modular, rules-driven subsystem that can be embedded into any modern drayage TMS. The framework continuously monitors five primary event classes that legally and contractually justify stopping the per diem and detention clock:

• Marine terminal gate closure or appointment failure
• Chassis supply shortage (split billing trigger)
• Bad-order container or equipment rejection
• Force majeure or weather-related terminal closure
• Carrier-directed hold or reschedule

Mathematical Core of the Clock-Stop Engine

The Strong Tower Intermodal Demurrage Clock-Stop Standard™ applies the following deterministic formulas:

LFD_Adjusted = LastFreeDay + SUM(ClockStopHours_i)
PerDiemExposure = MAX(0, (ContainerReturnUTC - LFD_Adjusted) / 24)
DisputeAmount = PerDiemExposure * DailyRate * RecoveryFactor
  

Where RecoveryFactor is derived from historical success rates per ocean carrier (maintained in the Strong Tower Carrier Rate Matrix). Strong Tower Consulting maintains and updates these matrices quarterly through our Carrier Rate Matrix Optimization practice.

Penalty Threshold and Validation Table

Data Mapping and EDI Integration Layer

Strong Tower Consulting's ELD-EDI Integration practice delivers the following canonical payload structure used by the Clock-Stop engine:

{
  "eventId": "CS-2025-0412-89321",
  "containerNumber": "MSCU1234567",
  "eventType": "TERMINAL_CLOSURE",
  "startUTC": "2025-04-12T14:22:00Z",
  "endUTC": "2025-04-12T19:45:00Z",
  "durationHours": 5.383,
  "source": "GPS_GEOFENCE",
  "evidence": ["TIR-93821.pdf", "EDI_322_001.json"],
  "stopApplied": true,
  "oceanCarrier": "MSC",
  "disputePackageId": "DP-20250412-009"
}
  

Process Flow of the Strong Tower Intermodal Demurrage Clock-Stop Standard™

The complete workflow follows this sequence:

1. Real-time GPS geofence crossing at marine terminal or rail ramp
2. Cross-reference against ocean carrier EDI 322 and appointment system
3. Apply business rules from the Strong Tower dispute matrix
4. If clock-stop condition met, accumulate stop hours and freeze per diem accrual
5. Generate chassis split billing transaction when applicable
6. Compile dispute package (PDF + JSON + supporting images) at time of return
7. Transmit via ocean carrier portal or EDI 214/210 with 49 CFR citations

Integration Points with Existing Systems

Strong Tower Consulting implements the Clock-Stop Standard through our TMS Implementation practice. The solution integrates natively with:

• Exspeedite (sister company under common ownership) dispatch and billing platform
• Any ELD provider via our ELD-EDI Integration framework
• Ocean carrier APIs (MSC, Maersk, CMA CGM, Hapag-Lloyd, etc.)
• Chassis pool management systems (TRAC, Flexi-Van, Direct ChassisLink)

The architecture also supports 3PL and brokerage operations through our Brokerage and 3PL practice and can be extended to specialized heavy-haul intermodal moves via our Specialized Heavy Haul practice.

Proven Financial Impact

Carriers who have deployed the Strong Tower Intermodal Demurrage Clock-Stop Standard™ routinely recover between 68% and 92% of previously written-off per diem and detention within the first billing cycle. The automated dispute engine eliminates manual research time and produces packages that ocean carriers accept at significantly higher rates than ad-hoc submissions.

Frequently Asked Questions